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Release Date:



OS Build 20349.1194

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Azure Stack HCI, version 22H2, see its update history page.  


This non-security update includes quality improvements. When you install this KB:      

  • It addresses an issue that affects Distributed Component Object Model (DCOM) authentication hardening. It automatically raises the authentication level for all non-anonymous activation requests from DCOM clients to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY. This occurs if the authentication level is below Packet Integrity.

  • It addresses a DCOM issue that affects the Remote Procedure Call Service (rpcss.exe). It raises the authentication level to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY instead of RPC_C_AUTHN_LEVEL_CONNECT if RPC_C_AUTHN_LEVEL_NONE is specified.

  • It addresses an issue that causes an OS upgrade to stop responding, and then it fails.

  • It addresses an issue that affects the Windows Search service. It causes the indexing progress for the service to be slow.

  • It addresses an issue that affects the Microsoft Azure Active Directory (AAD) Application Proxy connector. It cannot retrieve a Kerberos ticket on behalf of the user. The error message is, “The handle specified is invalid (0x80090301).”

  • It addresses an issue that affects scheduled tasks. They might run years in the future if the next occurrence crosses a daylight-saving time change and you set the machine's time zone to UTC.

  • It addresses an issue that affects Microsoft Direct3D 9 games. The graphics hardware stops working if the hardware does not have a native Direct3D 9 driver.

  • It addresses an issue that affects the font of three Chinese characters. When you format these characters as bold, the width size is wrong.

  • It addresses graphical issues in games that use Microsoft D3D9 on some platforms.

  • It addresses an issue that affects the WinHTTP Web Proxy Auto-Discovery service. It cannot start because the services fails to create a remote procedure call (RPC) endpoint mapper database entry. This occurs if the service restarts more than 500 times.

  • It addresses an issue that affects Microsoft Edge when it is in IE Mode. The titles of pop-up windows and tabs are wrong.

  • It addresses an issue that affects Microsoft Edge IE mode. It stops you from opening webpages. This occurs when you enable Windows Defender Application Guard (WDAG) and you do not configure Network Isolation policies.

  • It addresses an issue that affects input method editors (IME) from Microsoft and third parties. They stop working when you close the IME window. This occurs if the IME uses Windows Text Services Framework (TSF) 1.0.

  • It addresses an issue that affects driver installation on certain hardware. You cannot see the display of the progress of the installation.

  • It addresses an issue that affects Windows Defender Application Control (WDAC). It stops WDAC from logging .NET Dynamic Code trust verification failures.

  • It addresses an issue that affects .msi files. Windows Defender Application Control ignores them when you disable script enforcement.

  • It addresses an issue that affects a remote desktop virtual desktop infrastructure (VDI) scenario. The session might use the wrong time zone.

  • It addresses an issue that affects input focus order. This affects the Tab key when you start from the password box on a credentials page to sign in.

  • It improves Active Directory replication performance in large environments.

  • It addresses an issue that affects the Forest Trust creation process. It fails to place the domain name system (DNS) name suffixes in the trust attributes. This issue occurs on devices that install January 11, 2022 or later updates.

  • It addresses an issue that affects Server Manager. It might reset the wrong disk when several disks have the same UniqueId. For more information, see KB5018898.

  • It addresses an issue that affects certificate mapping. When it fails, lsass.exe might stop working in schannel.dll.

  • It updates the Windows kernel vulnerable driver blocklist that is in the DriverSiPolicy.p7b file. This update also ensures that the blocklist is the same across Windows 10 and Windows 11. For more information, see KB5020779.

  • It makes Microsoft compliant with US Government (USG) version 6 revision 1 (USGv6-r1).

  • It stops the start of daylight saving time in Jordan at the end of October 2022. The Jordan time zone will permanently shift to the UTC + 3 time zone.

  • It addresses an issue that causes the Host Networking Service (HNS) to stop working. This leads to traffic interruptions. For Windows Server 2019, this change is disabled by default. To turn it on requires a registry key. You can request this key from Microsoft through your Technical Account Manager (TAM). For Windows Server 2022, this change is enabled by default. No additional action is required after the system is updated.

  • It addresses an issue that might occur when you enable deduplication. The issue might cause a deadlock.

  • It addresses an issue that might affect auditing events for ticket-granting ticket (TGT) and ticket-granting service (TGS) requests. The issue might log event ID 521 and the status code 0xc0000078 (“Indicates the SID structure is not valid.”). Instead, auditing should log Kerberos Authentication Service failure auditing event IDs 4768 (TGT) or 4769 (TGS). If you enabled the policy "Audit: Shut down system immediately if unable to log security audits", the domain controller might suddenly restart and log stop code c0000244 (STATUS_AUDIT_FAILED).

To return to the Azure Stack HCI documentation site

Azure Stack HCI, version 22H2 servicing stack update - 20349.1066

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.

Known issues in this update



An inaccurate value might be returned when the allocated size of the Storage Spaces Direct Storage Pool is queried. This can be observed when querying with tools such as Windows Admin Center or PowerShell. The value returned might be significantly different from the correct allocated size.

We are presently investigating and will provide an update when more information is available.

How to get this update

Before installing this update

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

To install the LCU on your Azure Stack HCI cluster, see Update Azure Stack HCI clusters.

Install this update

Release Channel


Next Step

Windows Update and Microsoft Update


Go to Settings Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.

Windows Update for Business


None. These changes will be included in the next security update to this channel.

Microsoft Update Catalog


To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Server Update Services (WSUS)


You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

If you want to remove the LCU

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File Information

For a list of the files that are provided in this update, download the file information for cumulative update 5018485.

For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 20349.1066

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